Heya all

Will a Win 7 key still work for a Win 10 build? Since my new machine should be arriving next week - I'm hoping it the Win 7 key will still work, I don't want to have to buy another copy of windows. My current machine already has Win 10 so I'd like to keep that up as my plex server and use an old copy of Win 7 that I have to load Win 10 (if still possible). The original Win 7 key was used to upgrade to Win 10 on another machine - and I foolishly forgot to get the product key of that upgrade before I formatted the drive.